How to add a duplicate button to the cart?

Question

WordPress

I have a WordPress site with WooCommerce.
I want to make a buy button sticky at the bottom of the page in the product card.
I thought that you can do it with a hook, display a duplicate of the button and stick it at the bottom using css.
I use it

add_action( 'woocommerce_single_product_summary', 'woocommerce_template_add_to_cart', 20);

but the duplicate does not appear,
THEN DISPLAYS THE DOUBLE IN THE LIST and it is necessary in the product card

add_action( 'after_setup_theme', 'lets_add_cart_button' );
function lets_add_cart_button() {
  add_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart', 20 );
}

can someone tell me how to display a duplicate of the BUY button? (ONLY IN THE PRODUCT CARD)